Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8dce6b2d9b634a1…

MALICIOUS

PDF

76.1 KB Created: 2021-07-14 03:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a36eaee7c34a29f3469e73196405b04 SHA-1: c158dd82f29c4afa363d707349b9cb193de944aa SHA-256: e8dce6b2d9b634a1066e90a10e51ae4337b455f3536f77318d08183960202413
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, with a heuristic identifying an external URI pointing to 'laborke.ru'. The document body is heavily obfuscated, but the presence of an embedded URL suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself likely contains malicious JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7056

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/square?utm_term=resume+word+document+template+download
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee009482b49873592da310/1626210452149/geloxatabu.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec88f5d0153e73bf8c6892/1626114293632/wusejer.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60eda3bb46a7611a87d00492/1626186683982/dafetaga.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed25e2cdb2ce13c52352c2/1626154467027/42435952853.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c76d.bin
2acbe3b0dd8808ccdc40015a91f24c1697d9aa667677045618dac39b71463bb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC76D 10812 bytes
font_01_sfnt_off0000e073.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE073 16792 bytes
font_02_sfnt_off0000f885.bin
fdd8f56b58f2d1c009f5e67cfa49da5993615cfd098dd1968e7ef2b164e06fdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 16348 bytes

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